NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-04-24-01KPZTVSMQ581TTF55E2PE6P9V
Run Details
Model:
Claude Opus 4.7
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
6.2s
Cost:
$0.011500
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
80.33%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The rain fell steadily against the gothic windows of Ravenshollow Manor, where thirteen guests had gathered for dinner that evening. Inside the grand dining hall, crystal chandeliers cast flickering shadows across faces that smiled without warmth or genuine feeling. Lord Ashworth raised his wineglass slowly, offering a toast to friendships old and secrets that would remain buried forever. The butler, Mr. Pemberton, noticed immediately that one chair sat empty, though all thirteen guests had arrived before sunset. A sudden crash echoed from the library upstairs, silencing conversation and freezing every hand that held silverware midway through motion. Lady Ashworth stood abruptly, her napkin falling like a white flag onto the polished mahogany floor beneath shaking feet. Nobody moved for several long seconds, until the grandfather clock struck nine times with ominous deliberation throughout the silent manor. Detective Marlowe, seated quietly near the window, rose calmly and gestured for the others to remain exactly where they sat. He walked upstairs alone, following the trail of fresh blood that painted the carpet in deep crimson, accusing strokes. Behind the oak door, Professor Whitmore lay motionless, clutching a torn photograph that would unravel every secret hidden within Ravenshollow.
created_at
"2026-04-24T13:28:58.276Z"
4/24/2026, 1:28:58 PM
model
"anthropic/claude-4.7-opus-20260416"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
934
moderation_latency
(null)
generation_time
6093
tokens_prompt
46
tokens_completion
328
native_tokens_prompt
65
native_tokens_completion
447
native_tokens_completion_images
(null)
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"end_turn"
usage
0.0115
router
(null)
provider_responses
0
endpoint_id
"0fa65117-00d9-4835-808d-9b68041d9ce4"
id
"b3dadb18-4832-42b1-83ff-1f1ce27853af"
is_byok
false
latency
934
model_permaslug
"anthropic/claude-4.7-opus-20260416"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer
(null)
request_id
"req-1777037338-mO8vOhwHOfE2kpgbpERx"
session_id
(null)
api_type
"completions"
id
"gen-1777037338-xV97YgaXQCZaaB3MChN9"
upstream_id
"b3dadb18-4832-42b1-83ff-1f1ce27853af"
total_cost
0.0115
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
80.33%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
19
2
19
3
19
4
20
5
19
6
20
7
20
8
19
9
20